HHG stuck in mold

Hi All,
I tried my first single HHG last week end, I made it in a glass mold. From what I can tell it is thoroughly hardened, Only now I can't get it out of the mold. Anyone got any ideas without having to break the glass? I thought I read something about Acetone, however I can't find the info again and I don't want to ruin it if I don't have too. Does it have any effect in the mold at all?

Appreciate any assistance, I want to make more to start gifting my area, and I may have occasional questions.

Makiel Tweet